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Mouse events at the top of the JUNG chart

I built graphs with JUNG, but I'm not sure how to add mouse action listeners to the top of the graph.

Below is an example of my code, which, in my opinion, is most relevant for the problem.

layout = new FRLayout2<GraphNode, GraphEdge>(graph);
visualizationViewer = new VisualizationViewer<GraphNode, GraphEdge>(layout, new Dimension(1000, 700));

visualizationViewer.getModel().getRelaxer().setSleepTime(500);
visualizationViewer.setGraphMouse(new DefaultModalGraphMouse<GraphNode, String>());
        visualizationViewer.getRenderer().getVertexLabelRenderer().setPosition(Renderer.VertexLabel.Position.AUTO);
visualizationViewer.setForeground(Color.black);

In particular, I want to detect single and double clicks on the vertices of the graph and act on them.

Note. I saw a couple of old SO links, but none of the answers seem to help me. If someone could just give me the pseudo code or point me in the right direction, that would be very helpful.

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I think a complete example will help you and others better than just changing your code. The relevant part here, if you already have one VisualizationViewer, use this snippet:

visualizationViewer.addGraphMouseListener(new GraphMouseListener() {...});

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- - stdout , .

import edu.uci.ics.jung.algorithms.layout.CircleLayout;
import edu.uci.ics.jung.algorithms.layout.Layout;
import edu.uci.ics.jung.graph.Graph; 
import edu.uci.ics.jung.graph.SparseGraph;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.GraphMouseListener;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;

public class METest {

    public static void main(String[] args) {
        //Create a test graph
        Graph graph = new SparseGraph<String, String>();
        graph.addVertex("a");
        graph.addVertex("b");
        graph.addVertex("c");
        graph.addVertex("d");
        graph.addEdge("a->b", "a", "b");
        graph.addEdge("a->c", "a", "c");
        graph.addEdge("b->c", "b", "c");
        graph.addEdge("c->d", "c", "d");
        //Metrics
        visualize(graph);
    }

    public static void visualize(Graph graph) {
        //Layout graph.
        Layout layout = new CircleLayout(graph);
        layout.setSize(new Dimension(500, 500)); // sets the initial size of the space
        VisualizationViewer server = new VisualizationViewer(layout);
        server.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
        //Here you add the listener
        server.addGraphMouseListener(new GraphMouseListener() {

            @Override
            public void graphClicked(Object v, MouseEvent me) {
                if (me.getButton() == MouseEvent.BUTTON1 && me.getClickCount() == 2) {
                    System.out.println("Double clicked "+ v);
                }
                me.consume();
            }

            @Override
            public void graphPressed(Object v, MouseEvent me) {
            }

            @Override
            public void graphReleased(Object v, MouseEvent me) {
            }
        });
        //Show the frame
        JFrame frame = new JFrame("Simple Graph View");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().add(server);
        frame.pack();
        frame.setVisible(true);
    }
}
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